Machine for facing counterbores



(No Model.) 4 Sheets-Sheet 1. A. LATHAM. MACHINE FOR FACING GOUNTERBORESNo. 350,141. Patented'Oot. 5, 1886.

Figl- (No Model.) 4 Sheets-Sheet 2.

. A LATHAM MACHINE FOR FACING GOUNTERBORES.

Patented 001;. 5, 1886.

(No Model.) 4 Sheets-Sheet 3. A. LATHAM.

MACHINE FOR FAGING GOUNTERBORBS. No. 350,141. Patented Oct. 5, 1886.

, N. PETERS. Pholo-hlhngrnpher. wnmn mn. n cy 4 Sheets-Sheet 4.

(No Model.)

A, LATHAM. MACHINE FOR FACING COUNTERBORES. No. 350,141.

Patented Oct. 5, 1886.

WZZMMJ/ my /6m All/Illrlll/li '0 UNITED STATES Fries.

PATENT MACHINE FOR FACING COUNTERBORES.

SPECIFICATION forming part of Letters Patent No. 350,141, dated October5, 1886.

Application filed June 21, 1886.

T aZZ whom, it may concern.-

Be it known that I, ALBERT Lrrnur, of W'altham, in thecount v ol')[iddlesex and State of Massachusetts, have invented a new and useful.Improvement in Machines for Facing ()mmterbores, which will, inconnection with the accompanying drawings, be hereinafter fullydescribed, and specifically defined in the appended claims.

Figure 1 is a front elevation of a machine embodying my invention. Fig.2 is a top plan view or" the machine shown in Fig. 1. Fig. 3 is an endelevation,viewed as from the right in Figs. 1 and 2. Fig. t is adetached view showing the relative positions of the counterbore, thegroove-forming milling-cutter, and the lacing-cutter. Fig. 5 is adetached view taken as at the left of Fig. 4, and with the facing-cutteromitted. Fig. 0 is a detached view of theindex devices, taken as viewedfrom therightin Figs. 1 and 2. Fig. 7 is a detached view showing devicesby which the facingtool is adjusteth Fig. 8 is a detached verticalsection taken on line Z, Fig. 1, and viewed as from the right in thatfigure. Fig. 9 isa longitudinal vertical central section taken on lineX,Figs. 2 and 3, the lower portion of the machine being omitted. Fig. 10is an enlarged sectional elevation of the blank adjusting chuck. Fig. I1is an elevation taken at the left hand of Fig. 10. Fig. 12 is a detachedsection taken on line \V, Fig. 9. Fig. 13 is a detached section on lineV, Fig. 2, looking to the left therein. Figs. 1 L and 15 are projectionsshowing the lines of cut-in facing the counterlmres. Fig. 16 is anelevation like Fig. 11, but showing a chuck with four instead of twojaws.

My invention relates to machines adapted to cut the spiral end face orclearance upon the respective lips of counterbores; and it consists infeatures of novelty hereinafter fully described, and winted out in theclaims.

Referring,'again, to the drawings, A represents the bed of the machine,which will. be of such size, form, and proportion as to best adapt it tothe various other parts ofthe machine.

13 represents the headstock, in which is supported the arbor or livehollow spindle G, constructed and arranged in manner as follows, to wit:At the rear or outer portion of Serial No. 205,770. (No model.)

theheadstock a sleeve, (1, is closely fitted to slide lineallv, and isactuated by means ofpinion 1?, which engages the rack-like teeth cutinthe sleeve, as shown, said pinion being arranged in a slot, 0, in thestock, and being mounted on an arbor or stud, 1', on which lat ter issecured leverj, by which the pinion is actuated in the manner to bedescribed. A portion orspeed, D, of the pulley is formed with a sleeve,7;,which is fitted to revolve in the central portion of stock B, and alesser speed, E, of the pulley is bolted to I), as shown, and formedwith a sleeve, c, which is fitted in the front portion of stock B, as

shown. \Vit-hin said sleeves b c is the sleeve F, formed with wings g,which interlock in slotfin hub G- of speed D, and allow a free slidingmovement ofthe sleeveF. Said sleeve F and hol low arbor O areinterloelmd by spline It, to insure the coincident rotation of the arborwhen the sleeve is rotated by means of the pulley. The utility of thisconstruction and arrangement of the arbor, as also that of certain otherdevices carried by thearbor, will be hereinafter described. A taitstock,I, is ad .justably mounted on bed A, as shown, and

in the stock is mounted the sliding or dead spindle J, which carries theremovable chuck K, to be described, said spindle J being locked inposition by means of the eccen tric ring-binder L, (shown in sideelevation in Fig. 8,) and which is rotated by its handle to lock orrelease the spindle.

Instead of lineally adjusting spindle J by means of ascrew, in the usualmanner, it slides freely in its bearing when not locked by ring L, andit is adjusted in proper lineal position by means of its swinging hooka, which may be engaged with stud k, secured in stock I, a nut, at,being threaded and adjustable on said stud, as shown; and by movingspindleJ so that hook it bears against the end face of nut m the spindlemay thus be placed in its desireddineal position, and then be locked byring L; and when the ring is rotated to release the spindle hook it maythen be instantly swung clear of stud 7r, when spindle J may be moved.as desired.

The counterbore-facing tool is shown at p,

Figs. 1, 2, and is mounted and held in its stock or holder g, which ispivotally mounted in the cared plate 5, which is mounted upon plate t,to be revolved for adjustment of cutter p in a horizontal plane, saidplate t being mounted upon a plate, a, and susceptible of .adj ustmenttransversely to bed A, and having a gaging or stop screw, 5. Plate at ismounted and arranged to rotated upon plate 2;, which latter is mountedupon a bed, y, and is adjusted thereon in the direction of the length ofbed A by means of screw w, said bed y being locked in position by screwsz z. Said plate a is pivoted upon stud 2, seated in plate '0, this studbeing formed at top and bottom with teeth, engaged, respectively, withscrews 3 4, and by actuating screw 3 plate '0 and the parts therebysupported are rotated around stud 2, while by actuating screw 4 plate tand the parts thereby supported may be moved in and out or transverselyto bed A; hence by these movements and the movement of plate 1) by meansof screw w the cutter p may be adjusted as desired, the height of saidcutter being adjusted by means of the vertical rocking movement of itsholder q,- but as all the devices for holding and adjusting cutter p aredescribed and claimed in United States Patent No. 344,283, June 22,1886, I believe the foregoing description thereof to be sufficient. Thecounterbore-blank is shown at 6 as with the grooves formed and its stemportion 7 previously reduced. This blank is adjusted in the machine andheld by the following-described means: A chuck, K, has a stem or body,8, to be seated in spindleJ in the well-known manner of lathe-centers.Upon opposite sides of body 8 are pivoted the. jaws 9, provided with thegage-screws 10, while aspring, 11, tends constantly to force togetherthe outer ends of the jaws upon blank 6, as shown in Fig. 10. A center,12, is seated in body 8, and has an axial hole in its outer end toreceive the stem 7 of blank 6, as shown.

. sleeve and bears against a collar on spindle O, 1

In the hollow live-spindle G is secured a rod, 13, against which isabutted a helical spring, 14, which tends constantly to thrust outwardlythe headed rod 15, arranged to slide freely in spindle O, as shown inFig. 9. A self -expanding chuck, 16, is also secured in said spindle Oto revolve therewith, said chuck being closed by the compressive actionof sleeve F, which is forced outward by actuating hand-wheel H, which isthreaded on said as shown. 1

In practical use the tail-stock I is placed and secured in properposition, and nutm 011 stud 7a is properly adjusted, so thatwhen hook iton spindle J isengaged with stud It said spindle will be therebyproperly positioned; then to adjust a counterbore-blank in chuck 16 thehook it is swung upward away from stud is, after the ring-binder L isslackened and spindle J is moved to the rear, and

' a counterbore-blank is inserted between jaws f chuck K, the shoulderof the blank next its stem 7 being in contact with the end face ofhollow center, 12, which thus serves as a gage. After the blank is thuscorrectly positioned in chuck K spindle J is moved forward till hook itis engaged with stud k, and so that the hook bears against the end faceof nut m,

when the spindle J is locked by ring L. When spindle J is thus advanced,the thrust action of spring 14 upon rod 15 tends to hold the shoulder ofthe blank against the end face of 75 center 12; and while thus heldhand-wheel H is actuated to force outward sleeve F, and thus secure theblank firmly in chuck 16 without lineal displacement of the blankrelativelyto its adjusting or gage center 12. When chuck 16 is thusclosedupon the blank, ring L is released, hook at is raised from stud k,and spindle J is moved outward, in readiness to repeat the operationwhen the blank thus transferred to chuck 16 shall be finished. Whentheblank 6 is thus placed in chuck K and then transferred to chuck 16,its shoulder next stem 7 has always a fixed and determined position inthe machine,fregardless of the length of its body or portion of greaterdiameter, or of the length of its stem 7; and as said shoulder is toconstitute the highest point of the spiral faces of the lips, suchadjustment is of the highest importance.

It is preferable, especially in the smaller sizes of counterbores, tomill the grooves therein while in place in the machine in which thefacing or backing off of the lips is to be performed; and to accomplishthis I form bed A with an offset upon the rear side, as shown in Fig. 2,and on this I mount the stock M, to.

be moved in guideways by means of screw 1?. in a well-known manner, andupon a dovetail way of stock M is mounted the tool-carrying head N,arranged to be vertically adjusted'by screw 0, in a manner also wellknown.

In head N is mounted the sleeve R, which upon its upper side hasrack1ike teeth en-- gag-ed by pinion S, actuated by lever T, by means ofwhich the sleeve may be advanced toward the axial center of the lathe tothe extent permitted by stop-screw 20, carried by the sleeve, and whicharrests the latterby contact with head N, as shown in Fig. 3. In

said sleeve is journaled the conical-ended arbor V, which at its rearend carries the 'conical bushing U, as shown, said arbor being drivenvby abelt acting on itspulley 18, the milling-tool 19 being secured inthe front end of said arbor, as shown in Figs. 2, 3. Thus when thecounterbore-blank has been secured in chuck 16, as already described,the millingtool is advanced by means of lever T to the desired positionover blank 6, as shown in Figs. 4, 5, the same being determined bysetscrew 20, and sleeve R is then locked by setscrew 21, when byactuating screws 0 P the required depth and length of cut to form thedesired'grooves in the blank is obtained, the blank being adjusted andlocked in the desired positions for forming the requisite number ofgrooves by means of the indented index-ring 22, secured on spindle O,andits catch-arm 23, engaged and actuated by springpin 24, (shown inFigs. 1, 2, 3, and 6,) said ring being indented to correspond with thedesired number of grooves in the counterbore. After the blank is thusgrooved set-screw 21 is retracted and the milling-tool is moved to therear by means of lever T, as already described, when, ifit is desired togive a finishing cut to stem 7 ot' the blanka preferable methodcutterpwill be duly positioned, by the means already described, to give suchcut, and when once so positioned is not again in that behalf disturbeduntil rendered requisite in order to resharpen. it. The cutter is movedalong the stem to give such cut by means of screw to, which moves plate1;, on which the tool 1) is mediately mounted, a stop-screw, x, securedto plate y serving to check the advance of the tool when it arrives atthe shoulder of the blank.

To impart to the end faces of the several lands or lips of thecounterbore the requisite spirality, termed freeing, clearance, or"backing off, after the blank has been grooved, the following devicesare employed: A block, 25, secured on headstock B, has a truck, 26,pivoted therein, and a cam, XV, having as many throws as there are lipsin the counterbore, is secured on spindle C, while a spring, X, isarranged on said spindle, between its collar and sleeve a, so as to tendconstantly to hold said cam in contact with the truck 26. The lower endof lever j is engaged in block Y, which is arranged in a way upon bed A,and is moved lineally by means of rod Z, which is threaded in Y, andisactuated by the crank-wheel 27, secured upon its opposite end. A checkor stop screw, 28, is arranged in cap 29, to arrest the movement ofslide 1' and lever j when the cam \V has been moved out of contact withtruck 26, as shown in Figs. 1 and 2. \Vhen spindle U is held by lever jin the position shown in Figs. 1, 2, J-that is, so that cam \V mayrevolve without engaging truck 26the facing-tool 1) may, if desired, bemoved to take a fine finishing cut from the end faces of the lips of thecounterborc before commenc ing the oblique facing thereof or said cuttermay be moved close to the end faces of the lips and thus left, when byactuating sl ide'Y through rod Z the end faces of the counterbore willbe gradually brought into contact with cutter p, and by the coaction ofcam \V the cuts will be continued, as indicated in Fig. 14, till aspiral end face is formed upon the lips coincident with the long andflat oblique lines of cam \V, the short and steep oblique lines thereonserving, while the counterbore revolves the space bet-ween the lips, tomove the counterbore to the rear, so that the cutter shall not engagethe angle at the intersection of the end face and the cutting or radialline of the longitudinal groove. The stop-screw a: in such case is soadjusted that plate 0, when moved against it, will so positionfacing-tool 1) that when cam \V runs free against truck 26 the lips ofthe counterbore will have received their true spiral facing to give theclearance or freeing thereto.

Instead of operating the machine as just described, block Y may be soplaced that cam V will run in full constant contact with truck 26, thusimparting the full constant recipro' eating motion to arbor C, whilecutter 1) will, by the action of screw 10, be slowly advanced toward theend faces of the lips of the counterbore, so as to take at each.revolution thereof the required thickness of chip, in manner asindicated in Fig. 15, such movement of the cutter continuing till slider is in contact with stop .1, at which point the perfected spiral orfreeing will have been imparted to the lips of the counterbore.

In Fig. 16 the chuck K is shown as formed with four jaws to engage theseveral lips of a four-lip counterbore, such as is shownin Fig. 4-.

I claim as my invention- 1. In combination with spindle J and tailstock1, formed with a suitable transvm-se seat therein, the eccentric ring L,having an actuating-handle, and formed to receive said spindle and to itin the seat in stock I, substantially as specified.

2. In combination with a counterbore-facing machine, a gaging-chuckformed wit-l1 center 8, the jaws 9, theretopivoted, theiractuatingspring ll and gaging-screws 1.0, and a hollow center, 12,seated in center 8, to receive the stem of the connlerbore, allsubstantially as specified.

3. The (t)lllbillltll()ll,Wlbll agaging-chuck in the dead-spindle lotthe hollow spindle 0, its rods 13 15, with the interposed spring14,chuck 16, secured in said spindle, and sleeve F, arranged to closesaid chuck. and provided with an actuating hand-wheel, ll, by which toforce it against said chuck, all substantially as specified.

4:. The combination, with spindle 0, provided with mcansforendadjustment, of sleeve F, having wings g, and interlocked with saidspindle, pulley 1), mounted on sleeve F, and having hub G, with slots f,to receive wings y, whereby the rotation of pulley 1) imparts acorresponding motion to said spindle and sleeve, and allows a linearmovement thereof, substantially as specified.

5. The combination, with sliding spindle J, of its hook it, a stud, 75,secured in stock 1, and nut in, threaded on said stud to adjust theshoulder to receive said hook, all substantially as specified.

6. The combination, with sliding spindle C, of toothed sleeve 0,arranged between a solid abutment on said spindle, on the one hand, anda rcsistingspring having a solid abutment on said spindle, on the otherhand, and a pinion engaging the teeth of said sleeve and provided withmeans, substantially as described, whereby it may be rotated to lineallymove said sleeve, substantially as specified.

7. In combination with spindle O, PIOXitlOll with a chuck for holdingthe counterbore., and means for rotating it, the cam XV, roll 26,toothed sleeve a, the thrust-sln'ing X, pinion (I, engaging said sleeve,and devices, substan- IlO actuate the spindle in accordance with the 10lips of the counterbore and the requisite spirality or clearancethereof, substantially as specified.

ALBERT LA THAM. \Vitnesses:

'1. V. PORTER, EUGENE HUMPHREY.

